The Two Methods to Remove Crystal Water of Lanthanum Acetate Prepared by Synthesis Method Two – “II”

Method one:
Under vacuum conditions, the temperature is controlled at about 150 ℃; heating the lanthanum acetate, whose crystallization water number has not determined, to a constant weight, to obtain anhydrous lanthanum acetate.

Method two:
1. Weigh 10g of lanthanum acetate monohydrate, pouring it into 500mL capacity of a round bottom flask, and the add 100mL of DMF (dried), shaking the flask, so that lanthanum acetate (insoluble in DMF) can be dissolved in DMF as much as possible.
2. Add 150mL of anhydrous benzene, to separate out La (CH3COO) 3 • DMF.
3. The crystals are collected by filtration and washed with ether. And then place it in a vacuum desiccator for conservation, which is containing anhydrous calcium chloride and phosphorus pentoxide.
4. Place the crystals (Abu obtained Hatton) in drying apparatus, at the temperature of 210 ℃, heating (which can also use naphthalene as a heat bath) it to remove DMF, then anhydrous acetic acid lanthanum can be gotten.

 

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